Apparatus for use in truing the ends of welding fittings



Jan. 7, 1964 B. s. LlBY ETAL 3,116,561

APPARATUS FOR USE IN TRUING THE ENDS OF WELDING FITTINGS 3 Sheets-Sheet1 Filed Sept. 15, 1959 Jan. 7, 1964 B. s. LIKBY ETAL APPARATUS FOR USEIN TRUING THE ENDS 0F WELDING FITTINGS 3 Sheets-Sheet 2 Filed Sept. 15,1959 Jan. 7, 1964 as. LlBY ETAL 3,116,561

APPARATUS FOR USE IN TRUING ENDS 0F WELDING FITTINGS Filed Sept. 15,1959 3 Sheets-Sheet 3 United States Patent Ofifice Patented ran. 7, less3,116,561 APPARATUS FUR USE EN TRUENG THE ENDS (llF WELDENG FHTTINGBennie S. Liby, Port Arthur, and Edward R. Saunders, In, Port Neches,Tex, assignors to Texaco inc, New York, N.Y., a corporation of DelawareFiled Sept. 15, 1959, Ser. No. 50,943 9 Qlmans. (U. 33189) Thisinvention relates generally to welding fittings or connections andspecifically to an apparatus for the proper locating and positioning andthe holding of a weld L or tube turn so that the ends may be trued witha metal cutting machine.

The increase in the use of welded pipe connections or fittings, such asweld Us and tube turns, in the oil industry to replace threaded fittingsof similar type calls for practical economies in recovery operatoins forreuse of such connections or fittings. And even though such Us and otheriittings are expensive steel torgings, prior art recovery practiceresulted in their disposal as scrap, after recovery or the straight pipesections.

In the case of the more extensive salvage programs, the ends of usedwelding fittings are trued up in machine shops on lathes and similarmetal cutting machines, re sulting in increased costs for handling andtransportation to and from the relatively distant refinery or oil field.in addition, many users complained that the welding faces at the ends of93 fittings were not true and square with respect to each other. Morerecently, the expensive and time-consuming use of machine tools toobtain true ends on the welding fittings has been replaced by flamecutting.

Although the recovery processes disclosed in recently issued patentshave resulted in considerable savings, much time and effort are expendedto adjust the salvaged fitting in proper working position in order toget the finished to be true and in correct shape for reuse. In addition,when the worn pieces are not based on the same common dimension, i.e.short or long radius, further time and eiiort are required, since moreadjustments are necessary.

A short radius weld l. is one having a radius of curvature to thediameter or" the tube, while a long radius weld L is one having a radiusof curvature equal to 1 /2 times the diameter of the tube. Short andlong radius weld l.s are used primarily in plants and refineryconstruction and only a few in oil field and pipe line construction,where lon radius pipe bends are used almost exclusively. Long radiuspipe bends are used in refineries where possible but in the compactpiping required around operating units, it is necessary to use short andlong radius weld Ls in most cases.

Accordingly, it is an obiect of the present invention to provide animproved apparatus for the manufacture and/or recovery of weldingfittings such as Weld Us and tube turns.

it is another object of the present invention to provide an improvedapparatus for positioning a work piece correctly in a metal cuttingmachine for further processing of the ends.

And another object of the invention is to provide an improved apparatusfor locating and holding a work piece in a metal cutting machine fortruing the ends.

Still another object of the invention is to provide an improvedapparatus for the proper locating and positioning of a piece to besalvaged in a fiarne cutting machine.

These and other objects, advantages and features of the invention willbecome apparent from a consideration of the specification in the lightof the figures of the accompanying drawings, wherein:

FIG. 1 is a showing of a typical welding fitting, such as a weld L ortube turn, used in oil field or refinery connections, with one end truedand finished for reuse, and the other end rough-cut, as would bereceived from the salvage yard;

FIG. la illustrates the line from the rough-cut end;

PEG. 2 is an isometric view of the basic form of the marking jig;

FIG. 3 is an illustration of the method by which the proper position ofthe work piece in the holding jig is determined through the set up inthe marking jig;

PEG. 3a is a sectional View taken along line 33 of H6. 3';

FIG. 4- is an isometric view of the holding jig used in the locating andpositioning and the holding of the work piece;

FIG. 5 is a diagrammatic showin of a flame cutting machine using theapparatus of the present invention;

FIG. 6 is a cross section view taken in the plane of the axis of thework piece, such as a weld L;

PEG. 7 is a cross section view taken along the l ne 7-7 of FIG. 6;

FlG. 8 is a modification of a holding jig for use also as a marking jig;

FIG. 9 is a view parallel that of FIG. 3 and is an illustration or themanner for determining the proper position of the Work piece in themodified holding jig of FIG. 8; and

PEG. 1G is a modification of the holding jig with respect to theclamping of the work piece.

The objects of the invention are attained by means of apparatus which isused to locate a piece to be Worked on or salvaged in proper position ina holding device so that the axis of rotation of the held piece isdeterminate with respect to that of a rotary metal cutting machine.

Referring to FIG. 1, there is disclosed a work piece, in this case, asalvaged welding fitting in the form of a weld L, E, with a finished ortrue end at E and a rough-cut end at E This particular L is representedwith a sli ht amount of tangency (t 1 at each end. Other fittings mayhave no end tangency, in which case the outside surface of the weld L(or tube turn) would lie along the position indicated by the line ofdashes in this figure. Even though weld Ls and tube turns of re samenominal size may have different curvatures, as indicated by the dash andfull lines in FIG. 1, they ll have a common characteristic, viz. acommon point of intersection of the axial distances indicated as :1 and:1 which are equal to each other, as are the corresponding distances inall other weld Us or tube turns of the same nominal size.

These axial distances are measured to their point of intersection fromand perpendicular to the centers of the circular cross sections of theweld L made by the respective planes intersecting at the center ofcurvature of the weld L and passing through the points or tangenoy ateach of the ends of the arc of the weld L, the point oi intersectionlying on an axis containing the radius of curvature which bisects theangle between the intersecting planes, as well as the arc of curvatureof the weld L, and so can be described as a neutral axis.

In PEG. 1, the radius of curvature of the weld L with its center at O isindicated as on the reference axis OY, and the point of intersectionthereon is at Y, d, and :1 being measured for the solid line weld L,with d' and d' being measured for the dash line weld L, whose center ofcurvature is shown at O and the bisecting radius of curvature on theaxis OY. in the case of a 90 weld L, the reference axis containing theradius of curvature bisects the angle between the intersecting plan-esinto 45 each and pivo-td movement of the positioned work ieoe about thepoint of intersection, when it lies exactly on of removal of the WeldBildhl" 3 the outside surface of the weld L, 45 in either direction willmake the axis coincident with the axial distances 0!, and d (or [1' andd';,) coincident with the reference axis ()Y (or O-Y).

If the point where the reference axis OY intercepts the outside surfaceof the weld l. or tube turn can be marked, as by a punch, then the punchmarl; can be used as a reference point to position the weld L or tubeturn in a holder or jig designed to support the work piece in properposition for rotary cutting of the rough or unfinished ends, so that thefinished end, upon which the cut has been completed, would be in a planewhich is parallel to the supporting face of the rotary cutting machine.Pivoting the work piece 90 with respect to the reference point andfinishing the rotary cutting of the other end would result in tne endsof the weld L being true and square with respect to each other.

When the weld Us or tube turns are recovered from the field, the pipeline containing the welding fitting is cut to retain the welds on eachend of the fitting. These welds are burned off in salvage to give ausable fitting which has an end bevel corresponding to that provided inthe original fitting, less the portion which has been removed by burningoil. PEG. 1a, represents two pieces of metal welded together, e.g. atthe rough-cut end E of FIG. 1. if it is desired to burn to the left ofthe original end, the burn will be made just to the right of the line aaof la, and will result in the removal of all of the original welded end.

H6. 2 is an isometric view of the marking jig, in which the weldingfitting is marked for its proper positioning in a holding device 0 jigused on the turntable of the flame cutting machine. The marking jig,indicated generally as 1, consists of parallel planar members, M, N, eg.wooden board members or of other suitable material, 181d in spaced apartdistance from each other, S, by the two parallel bolt clamping members,R R and a spacing member, V, each located along the outer edges of thejig l. The distance or spacing S is adjusted to give a snug fit for allwelding fittings of the same nominal size. Therefore, the marking jigdisclosed in FIG. 2 can be adjusted once and maintained with the correctspacing between the planar members (M, N) until there is a need fordifferent spacing.

There is some clearance between the spacing member V and the outside orback surface of the fitting, as disclosed clearly in the cross-sectionof FIG. 3a. A spring loaded punch T, is mounted in box W, which issupported on member V, the position of this punch being such that whenits sharpened point U contacts the fitting, it makes the impressionindicated at U. The point U is equidistant from the parallel members Mand N, and the center lines of the bolts R and R i.e. the distances fromM to U and N to U are one half of the spacing S and the projecteddistance is equal to the projected distance 11 FIG. 3.

The position of the salvaged fitting is adjusted in the marking jig sothat the fitting is tangent to the bolt members R and R and thedistances from the edges 2 2 0' e of the parallel members M and Nrespectively, to the center lines of the welds at each end, indicated as0 and C2, FlG. 3, are equal. The respective edges are at right angle toeach other when used in a jig for a 90 weld L, and generally correspondto the intersection planes passing through the center of curvature. Inother words, when the dimension c;+b is equal to the dimension c +b thepoint U will lie exactly along the axis O-Y, as indicated in FIG. 3.When this condition has been attained, the punch T is struck solidlywith a hammer or other instrument and the point U makes the impression Uupon the outside surface of the L.

4 is an isometric view of the holding jig for use with a fitting onwhich the impression U has been made in the marking jig. The holding jig(of PEG. 4) consists of the box shape cradle A and the U-shape cradleadinst-er B. T cradle A includes the side flanges A and i supported inparallel relationship by the rectangularly disposed recessed end flangesA and A, and the curved 72- l; flange member, A

The end flanges have their cutaway recesses open on lg side of theholding jig so that when the work piece or fitting is placed thereon(see FIG. 5), contact with and support occurs at separate points alongthe edges 1 p 12 and p and with the pointed end P of pin P. The recessesin the end flanges may have any shape so "i to form a symmetricalpattern, but the simplest ars angernent is rectangular, as that of thecorner of a quare, is disclosed in FIG. 4. The axis of the Pill isseated along the intersection of the planes passing hrough thelongitudinal and transverse cross sections, shovm in PEG. 6 and MG. 7,respectively.

The P is positioned in the centering pin guide, Q, which has anelongated slot L in which the lock pin L, which through a hole in pin P,rides. A strong 5;: 'ing is positioned between the lock pin and thebottom or side surface of the curved back flange member A of the cradle,and forces the centering pin against the outside surface of the weldingfitting into the impression U which has been placed thereon by means ofthe marking g of Pro. 2..

The cradle is properly aligned with the cradle adjuster by means ofbolts X (also see FIG. 7) which. are pcened to the upright arms of thecradle adjuster and through. slots in the side flanges of the cradle,the cradle and juster being fastened together by means of the nuts, Xfitting on the bolts X and the pivot bolt and nut assemblies at P whichoperate in the slots F in the side flanges of the cradle, therebyforming an integrated cradle means.

In addition, there is the cradle adjuster screw 2: sembl'] at Kincluding the screw which engages a threaded hole in the bottom of thecradle adjuster, the plain end of the screw fitting into a fastenerplate K attached to the outside surface of the curved back flange memberof the cradle. By means of this cradle adjuster screw assembly, it ispossible to align the axis of each axial distance with the axis ofrotation of a rotary metal cutting machine, eg. a flame cutterturntable, when the position or" the point contact between the end ofthe spring loaded pin P with the impression U on the outside surface ofthe welding fitting does not coincide with the point of intersection ofthe axial distances (see FIG. 1). The adjuster screw assembly at Kvaries the distance 6, FIG. 7, such adjustment being required to bringthe axis of rotation of the workpiece into alignment with that of theturntable. This adjustment has the eilect of making the axis of rotationpass through the point where the axial distances, :1, and d intersect.When this relationship exists, the upright or vertical leg of thefitting in the cradle (see FIG. 5) will rotate coaxially with turntableand the other leg will rotate therewith when the holding device has beenrotated 90. Following such distance adjustment, an additional arbitraryadjustment is necessary. Since the welding fitting wall thickness isgreater on the inside curve of the fitting than on the outside curve, itis necessary to shift the fitting about Ms closer to the flame tocompensate for this difference in metal thickness, i.e. toward the sideon which the inside of the fitting is located. In FIG. 5 this would beto the right.

With reference to FIGS. 6 and 7, it is the cradle adjuster B whichpivots about its axes of support by means of the bolt assemblies Fpassing through the vertical support standards at D D on the base D,which is clamped by means, e.g. wing nuts or bolts, to the slidingmember on the rotary table of a flame cutting machine (see FIG. 5).

Referring back to FIGS. 4 and 5, the U-shape cradle adjuster has threesimilar holes, each indicated as 11, into which holding pin Z may beinserted through a corresponding hole h in standard 1),, either forplacing the work piece in proper position on the cradle, or to bring.

one or the other end of the welding fitting into position for truing.

When the pin Z is inserted into the center hole of the cradle adjuster,the cradle is in proper position, i.e. level, for receiving a work pieceor welding fitting which has been marked with the reference impressionU. When the cradle adjuster is pivoted about its axis of rotation andthe pin Z is placed in either of the two outer holes, one or the otherend of the welding fitting is in position for truing. One [of such outerholes is disclosed in FIG. 5, while the other two holes are behind thestandard D the pin Z engaging the other outer hole. These outer holesare positioned at 45 with respect to the axis of rotation of theturntable and the longitudinal axis of the U shape member.

The work piece or welding fitting is held in position in the box shapecradle by means of a holding chain H which engages the hook at G and istightened in position against spring I by the handle C. A turn buckle orother tightening means could be used also. After one end has been trued,the entire holding jig or device is rotated 90 by positioning theholding pin in the opposite outer hole. A slight correction in positionof the base D may be required to obtain a satisfactory truing of theends but such adjustment is conventional.

The disclosure of the marking jig of FIG. 2 and the holding andpositioning device of FIG. 4 have been restricted specifically for usewith a 90 weld L. However, the holding device as disclosed herein can beused also with other angular weld Ls, as, for example, in the case of180 return bends, which could be cut by a flame cutter, just as a 90weld L is cut, and could be held in a vertical position by a holdingdevice similar to the one described herein. it would be necessary toshift the entire holding device and the return bend to the right or tothe left on the turntable to make the axis of the axial distance of eachleg of the return bend coaxial with the axis of rotation of theturntable.

BESS. 8 and 9 show a modification whereby the holding jig may also beused as a marking jig. This involves the combination of the structuresof FIGS. 2 and 4, wherein the pin P (see PEG. 6) telescopes through theadjusting knurled screw of the assembly K. This modified pin, indicatedas P FIG. 8, functions not only to engage any impression which may havebeen made at the reference point U on the out-side or back surface ofthe welding fitting when a separate marking jig has been usedpreviously, and to keep this point in such position that it will liealong the axis OY, as disclosed in FIGS. 1 and 3, but also to locate thesame point, as shown in FIG. 9, which discloses the same principles fordetermining the point of intersection of the axial distance, d and dwith the same lettering being used for the same or similar features.Since the manner of support of the cradle, the cradle adjuster and thecradle holder are the same as in the basic structure, along with the tiedown or holding chain H and its supporting features, no furtherdescription of this modification of FIGS. 8 and 9 will be made.

FIG. 10 shows another modification of the holding jig for clamping thework piece in position. Since the welding fittings are forgings whichhave diameters of the same nominal size that do not vary by more thanabout & of an inch, it is feasible to use a holding jig wherein it ispossible to pull the sides together to serve as a clamp. This is done bymeans of a tightening nut and bolt assembly at R which draws togetherthe elongated side flanges AA, AA, to clamp the welding fitting withoutthrowing it too much out of position insofar as the vertical alignmentis concerned. This modification would require a holding jig fordifferent diameters of the welding fitting, as contrasted with the moreuniversal holding jig disclosed in H68. and 7, in which the work pieceis held in position by the chain H.

Since the work piece or fitting is inserted into contact with therecessed end flanges A and A and has point 6 contact along the surfacesp p p and p (and contact with the pointed end P of pin P), the sizelimit of work pieces is controlled by the spacing between the sideflanges A and A and specifically by their edges at X and X so thatconsiderably larger work pieces could be used with the modification ofFIGS. 8 and 9 than is possible with the marking jig of PEG. 3. Also, thelower limit would be determined by the restraining chain. Consequently,once the work piece has been centered in the manner disclosed in FIG. 9,the outer exposed end P of pin P may be struck to form an impression Uon the outside for reference purposes.

Thus, there has been shown and described a novel apparatus for thelocating and positioning and the holding of a welding fitting so that itis possible to true both ends of a welding fitting with great ease andeconomy and with the ends at a determined angular relationship with eachother. Although the disclosure herein has been directed specifically tothe use of a flame cutting apparatus, the principles disclosed hereincan be used on other rotary metal cutting machines, such as a lathe,vertical boring mill, drill press and the like, where it is necessarythat the axis of rotation of the machine as well as that oi the workpiece be coincidental.

Although modifications and variations of the invention as set forthabove may be made without departing from the spirit and scope thereof,only such limitations should be applied as are indicated in the appendedclaims.

We claim:

1. An apparatus for holding a curved tubular welding fitting such as aweld L and tube turn in a metal cutting machine having a rotatable worktable comprising the combination of support and integrated cradle means,said support means including a base with a pair of parallel standardsextending upward therefrom, said cradle means being pivoted thereontherebetween and including adjusting and positioning members, thepositioning member being adapted to locate the intersection with theoutside surface of said fitting of an axis containing the radius ofcurvature of said fitting passing through the point of intersection ofthe axial distances measured perpendicularly from the centers of thetrue ends of said fitting, the adjusting member being interconnectedwith said locating member for positioning said fitting so that its axisof rotation is coincident with that of said work table.

2. An assembly for use in the recovery of a curved tubular weldingfitting such as a weld L comprising a support adapted to be secured toan adjustable base on a rotary turntable of a dame cutting machine, apair of upright parallel standards extending from said support, meanssupported between said standards including a cradle member for receivinga fitting therein and adjustable means in engagement with said cradlemember and pivoted on said standards for positioning the fitting withrespect to said base, and means for locking said last mentioned meanswith respect to said standards ranging through a arc.

3. An apparatus for holding in a metal cutting machine a welding fittingsuch as a weld or tube turn in proper position for truing and squaringthe ends with respect to each other comprising a pair of opposed sideflanges and a pair of end flanges having recesses with the same sy 1--metrical pattern about their neutral axes and held in spacedrelationship by said side flanges, and a curved back flange joined tosaid side and end flanges to form an open cradle therewith, means forpivoting said cradle in an adjustable position about a rotatable membercomprising a U-shape member enclosing said cradle from the side of saidback flange and joined to said cradle, means for adjusting the positionof said cradle to said last mentioned means joined thereto and to saidback flange of said cradle, and support means joined to said means forpivoting said cradle in pivotal arrangement therewith, said properposition comprising the coincidence of the axis of rotation with therespective axes containing the axial distances measured perpendicularlyfrom the centers of the true ends of said fitting;,. said cradleincluding a locating means with an axis at the: intersection of theplanes through the neutral axes of the side and end lianges.

4. In the apparatus as defined in claim 3, means tor" holding saidfitting in position in said cradle for cutting off the ends thereof andcomprising an adjustable chain.

5. in the apparatus as defined in claim 3, means for retaining saidfitting in said cradle comprising a bolt and nut clamping assembly, saidside fianges being extended beyond the dianictral dimension of saidfitting and having perforations for receiving said clamping assembly.

6. A device for properly locating, positioning and holda welding fitt 1gsuch a weld t. or tube turn tor tru ng and squaring the ends in a metalcutting machine ..g a rotary support member comprising an open facecradle member consisting of a first pair of parallel planar membersserving as side flanges, a second pair of planar members serving as endfianges joined to said first pair and lying in planes normal to other,and a back fiange joined to said side and end flanges, said end flangesg the same cut out portions symmetrical with respect to tile neutralaxis of each of said end flan es, a marking and locating means forindicating on the outside surface of said fitting the intersectiontherewith of an axis containing the radius of curvature which extendsthrough the point or" intersection of the axial distances measuredperpendicularly from the centers of the true faces at the ends of saidfitting when centered in said cradle members, the axis of (1 mar g andlocating means being at the intersection ot planes through the neutralaxes of said side: and end flanges, pivot d adjusting means for saidcradle member comprising U shape member enclosing said cradle memberfrom said back flange thereof and joined to said side flanges in slidingrelationship therewith, said adjusting means being joined to the backflange of said cradle member and being in telescoping relationship withsaid marking and locating means, means for pivotally supporting said Ushape member being adapted to be held in rotative arrangement on themetal cutting machine, means for holding said fitting on said cradlemember, and means for locking said pivot and adjusting means in adeterminate position in a range of 90.

. in combination in a metal cutting apparatus, a base member havingstandards for ro-tative support with means for positioning properly andholding a welding fitting for rotative finishing of ends thereofcomprising a cradle member consisting of a first pair of spaced apartsubstantially parallel planar members and a second pair of planar members for maintain ng said first pair of planar members in fixed spacedrelationship, the members of said second pair being in planes normal toeach t .er and comprising end flanges for spacing equidistantlytherefrom said ends of said fitting, means spaced equidistantly betweensaid planar members and having its axis at the intersection of theplanes through the longitudinal and transverse sections of said cradlemember whereby the intersection at the back surface of said fitting ofthe axis containing the radius or" curvature passing through the pointof intersection of the axial distances measured perpendicularly from thecenters of the true ends of said mung may be indicated, means forpivoting and adjustably supporting said cradle member comprising a Ushape member, and means for adjusting the position between said U shapemember and said cradle member, and means for selectively positioningsaid U shape member with respect to said standards whereby said cradlemember may be rotated through an arc wherein said standards maintain abisecting relationship with respect to the outer limits of thepositions.

8. A marlt'ng jig for locating on the outside surface of a tubular l gfitting such as a weld t. or tube turn the intersection therewith of anaxis containing the radius of curvature of said fitting passing throughthe point of intersection of the axial distances measuredperpendicularly from the true end faces of said fitting and comprising apair of spaced planar members having a generally sectorlilceconfiguration with a pair of. straight edges extending at right anglesto each other for defining said configuration and a pair of spacingmeans for maintaining said planar nienioers in fixed parallelrelationship to each other joined t iereto and located at the outer endsof said straight edges, and a fixed means located equidistantly betweensaid planar members and from said spacing means for indic ting saidintersection, said last mentioned means includg a punch andinterconnecting said planar members, said ig being adapted to enclosesaid welding fitting between and in contact with said planar members andsaid spacing means whereby said straight edges are located adjacent thetrue end faces of said fitting.

9. A. device for indicating the proper holding position in a metalcutting apparatus of a tubular curved Work piece having ends to beremoved and requiring rotation of said Work piece during the removal ofsaid ends comprising a pair of spaced planar members having a generallysector-like configuration with a pair of straight edges meeting inprojection at right angles to each other, a pair of means for retainingsaid planar members in spaced apart fixed parallel relationshipinterconnected therewith at the outer edges of said members and at theouter ends of said straight edges, and a single means for locating areference point on said work piece for the determination of its axis ofrotation with relation to said apparatus spaced equidistantly betweensaid planar members and from said last mentioned means and beingsupported by said planar members, said device being adapted to receivesaid tubular curved work piece thereby enclosing the same between saidplanar members and in contact with the pair of retaining means wherebysaid pair of straight edges are adjacent said ends to be removed.

References in the file of this patent UNITED STATES PATENTS UNITEDSTATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No, 3, 116,561January '7, 1964 Bennie ,S. Liby et a1.

It is hereby certified that error appears in the above numbered patentrequiring correction and that the said Letters Patent should read ascorrected below.

Column 1, line 13, column 2, lines 1 and 42, column 3, lines 6 and 8,column 6, lines 31 and 59, column 7, line 14, and column 8, line 11, for"tube turn", each occurrence,

read similar pipe fitting column l,- l-i-nes l6 'and 55, column 2, lines44 and 50, and column 3, line 18, for "tube turns", each occurrence,read similar pipe fittings Signed and sealed this 7th day of July 1964,

(SEAL) Attest:

ERNEST W; SWIDER v EDWARD J. BRENNER Arresting Officer Commissioner ofPatents

1. AN APPARATUS FOR HOLDING A CURVED TUBULAR WELDING FITTING SUCH AS AWELD L AND TUBE TURN IN A METAL CUTTING MACHINE HAVING A ROTABLE WORKTABLE COMPRISING THE COMBINATION OF SUPPORT AND INTEGRATED CRADLE MEANS,SAID STANDARDS EXTENDING UPWARD THEREFROM, SAID CRADLE MEANS BEINGADAPTED TO LOCATE THE INTERSECTION WITH THE OUTSIDE SURFACE OF SAIDFITTING PASSING THROUGH THE POINT OF INTERSECTION OF THE AXIAL DISTANCESMEASURED PERPENDICULARLY FROM THE CENTERS OF THE TRUE ENDS OF SAIDFITTING, THE ADJUSTING MEMBER BEING INTERCONNECTED WITH SAID LOCATINGMEMBER FOR POSITIONING SAID FITTING SO THAT IS AXIS OF ROTATION ISCOINCIDENT WITH THAT OF SAID WORK TABLE.